join groups join，group by，幫我寫(xiě)個(gè)sql語(yǔ)句？ 2021-03-14 2547 join，group by，幫我寫(xiě)個(gè)sql語(yǔ)句？ join，group by，幫我寫(xiě)個(gè)sql語(yǔ)句？
